Electromagnetism MCQs
Practice free Electromagnetism multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 221 questions — no login required.
Question 91easy
Tropospheric scatter is made for communication of frequencies in the range
Question 92easy
Range of space wave communication in metres equals, where ht and hr are respectively the heights of transmitting and receiving antennas in metres.
Question 93easy
If the electric field is f = ? ? ar , in cylindrical co-ordinates, then the work needed to move a point charge Q to a point at twice the radial distance is
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Question 94easy
In free space E (z, I) = 50 cos (wt ? 0 z) ax (V/m), then the average power crossing a circular area of radius 2.5 m in the plane Z = constant is
Question 95easy
The intrisic impedancen of a conducting medium for which = 58 MS/m, 1r= 1 at a frequency f = 100 MHz, is
Question 96easy
A half-wave diople is placed at a distance S = y/2 from the apex of a 90? corner reflector. Find the radiation intensity in the direction (A = 900, =0?), given afeed-point current of 1A.
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Question 97easy
The depth of penetration of a wave in a lossy dielectric increase with increasing
Question 98easy
A very lossy, m/1 long, 502 transmission line is open circuited at the load end. The input impedance measured at the other and of the line is approximately
Question 99easy
In a homogeneous nonconducting region where P1r = 1, the value of Cr will be IGiven E = 30n. ejlmt- 4/301 a = 1.0e-i(mt- 4/331)1 ax (Aim)